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The San Francisco 49ers have another encouraging sign on Nick Bosa’s recovery timeline.

David Lombardi of the San Francisco Standard wrote on X that Bosa is “tracking well for a Week 1 return,” adding that rookie defensive lineman Mykel Williams will be “a closer call” after suffering his ACL injury six weeks after Bosa’s. Lombardi’s update came while reacting to workout footage of 49ers defensive end Keion White, who also appears to be progressing well.

The Bosa note is the bigger 49ers development.

San Francisco has already had reason for optimism. General manager John Lynch said at the NFL Scouting Combine that Bosa’s rehab had been “excellent” and that the team anticipated him being ready for training camp, though Lynch was less certain about the full offseason program. NBC Sports Bay Area noted at the time that Bosa was roughly five months removed from surgery and that training camp would put him about 10 months post-operation.

A Week 1 target would be the next step in that progression, and it would be a major one for a 49ers defense that spent much of last season trying to compensate for the loss of its best pass rusher.

49ers News: Nick Bosa Given Week 1 Return Timeline

Bosa tore the ACL in his right knee during the 49ers’ Week 3 win over the Arizona Cardinals. Kyle Shanahan confirmed the injury the following day, and the 49ers announced that Bosa would need season-ending surgery. Through the first two games of the season, Bosa had already recorded 2 sacks, eight quarterback pressures and 15 tackles.

“You don’t just replace a guy like Nick,” Shanahan said at the time, according to the team’s official site. “Everyone has to get better.”

That line aged like a warning.

The 49ers’ defensive front was supposed to be the engine of the defense, but the injuries changed the math. Lombardi wrote for the San Francisco Standard in April that the 49ers finished the 2025 season with a league-low 20 sacks and ranked No. 25 in defensive EPA after the defense was hit by injuries to Bosa, Williams and others. He also quoted Lynch calling Bosa and Williams “force multipliers” who make players around them better.

That is why the Week 1 framing matters. This is not just about whether Bosa is available. It is about whether the 49ers can get back to playing defense the way the roster was built to play it.

Bosa changes protection plans. He changes third downs. He changes how much help San Francisco needs from blitz packages and how quickly opposing quarterbacks have to get the ball out. Even if he is managed early in the season, having him available from the opener would give the 49ers a much cleaner path to rebuilding their pass rush.

Williams remains the more uncertain piece based on Lombardi’s update. That tracks with the timing of the injuries, as Williams’ ACL came later in the season. The 49ers do not need to rush him into September if Bosa is back, but they do need enough edge depth around Bosa to avoid overloading him immediately after a major knee injury.

49ers Schedule Becomes More Interesting With Bosa’s Return

The full 2026 49ers schedule has not been released yet, so there is no confirmed Week 1 opponent. The team’s official site said the full schedule with dates and kickoff times will be released in the spring.

But the opponent list is already set, and it makes Bosa’s status worth tracking closely.

San Francisco’s 2026 home opponents are the Arizona Cardinals, Los Angeles Rams, Seattle Seahawks, Denver Broncos, Las Vegas Raiders, Philadelphia Eagles, Washington Commanders, Miami Dolphins and Minnesota Vikings. The road slate includes the Cardinals, Rams, Seahawks, Dallas Cowboys, Kansas City Chiefs, Los Angeles Chargers, New York Giants and Atlanta Falcons.

That is not a soft landing for a defense trying to reestablish itself.